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Friday, July 30, 2010

The fact that part of our new IMPACT teacher evaluations is based on student test scores, this study matters. New research shows that the value-added measures used in some teacher evaluations to measure student growth over time can be inaccurate, Washington Post blogger Valerie Strauss writes. There is a 25% chance that an average teacher could be identified as poor when using three years of data, according to a report by Mathematica Policy Research. That rate climbs to 35% if only one year of student data is studied. The Washington Post/The Answer Sheet blog

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